I do a LOT of wiring - professionally, and at home - and these are easily the best crimpers I've found. Not only are they built right (cutter outboard of crimpers), but they have 2 crimp jaws AND 2 final crush jaws (something that's not mentioned in the description, and barely visible in the photo). The crush jaws are really the clincher on these UNDERPRICED pliers: once you've crimped the connector to the wire, crushing it makes it ~3x tighter, and less-likely to pull apart, even if you try. With these crimpers, unlike most higher-priced brands, you can actually produce crimps that look like industrial wiring. And they cost ~1/3 of those other brands. The only reason I didn't give them 5* is because they're not made in USA.